Patterns are the start of learning algebra - because generalising number rules is a good way to start thinking about abstracting numbers and their relationships.
BBC KS1 Bitesize Number Sequences Game - has several levels of difficulty to extend students - Molly has to jump on the right numbered plank in a bridge across a river - gives a chance to try again if you pick the wrong plank - works best with sound.
Did you know that square numbers are the sum of the sequence of odd numbers? e.g. 9 is the sum of 1,3,5. 16 is the sum of 1,3,5,7. And so on. First written up by Fibonacci in his Book of Squares. See this 3 minute MathTV on YouTube for more info.
Websites
Good websites for teaching or practicing patternsFamous Number Sequences
Interesting number sequences (you'll have to decide whether your students will cope with these)Fibonacci Numbers
Pascal's Triangle
Interesting Number Pattern Facts and Ideas
Did you know that square numbers are the sum of the sequence of odd numbers? e.g. 9 is the sum of 1,3,5. 16 is the sum of 1,3,5,7. And so on. First written up by Fibonacci in his Book of Squares. See this 3 minute MathTV on YouTube for more info.